臂架变幅机构
arm support luffing mechanism
补偿滑轮组变幅机构
Luff mechanism of compensative sheave block
四杆变幅机构
Variable Range Four-bar Linkage
四连杆变幅机构
four-linkage derricking mechanism
变幅导丝机构
thread guide mechanism with variable stroke
机构变更需求
mechanization change request
形状可变机构
Shape-changing Rigid-body Mechanisms
电机机构
motor operating mechanism
光机机构
optical mechanical construction